Villa are set to fly out to Philadelphia this afternoon as the USA Tour begins.
Paul Lambert's men face Union before moving on to Chicago and Portland during the ten-day trip.
Lambert has named a 25-man party.
Here is the full squad list:
Gabby Agbonlahor, Nathan Baker, Barry Bannan, Darren Bent, Samir Carruthers, Ciaran Clark, James Collins, Nathan Delfouneso, Fabian Delph, Richard Dunne, Karim El Ahmadi, Shay Given, Gary Gardner, Brad Guzan, Chris Herd, Brett Holman, Stephen Ireland, Daniel Johnson, Eric Lichaj, Matt Lowton, Andy Marshall, Charles N'Zogbia, Enda Stevens, Stephen Warnock, Andi Weimann.
For full information, visit our USA 2012 tour guide.